The cable will run from the 49.9MW Willows Green Solar Farm near Felsted will the built mainly under roads for 5.3km east of the proposed solar farm to Braintree Substation near Galleys Corner.
At full capacity, 50MW is enough to power ~60,000 homes! That's enough for nearly 10% of all of Essex. Glad these are getting connected even though there's plenty of North Sea oil and gas. UK! UK! UK!
Depends on how they're inverting the power. If they're sticking with the DC voltage straight from the panel, that's probably one thick cable. If each panel or group of panels has an inverter to go to high voltage (AC or DC) to a central location, you can proportionally scale the thickness as voltage increases.